As I've produced a few upgrades, I'll post them here rather than have people search for them
Filament cooler duct - https://www.thingiverse.com/thing:4584870
Static X guides - https://www.thingiverse.com/thing:4577513
Z guides - https://www.thingiverse.com/thing:4580455
XZ guide - https://www.thingiverse.com/thing:4570666
1" angle iron *snert*
those new Z guides are looking really good!
I caved and bought 2 linear rails. like @Michael G one to replace the X axis guides and the other to replace the Z. i havent actually tried to print anything until they turn up. im hoping they will turn up today.
Well. I'm sure this isn't helping...
A straight edge placed at the bottom of the Z upright shows it's slightly bowed.
I'm still not happy with the Z gantry guides. As these are crucial for lead screw alignment, I'll get the Vernier out.
I only use PETG - PLA is for indoor decorations.
Try them, they're not going to overheat and should take a long time to wear noticeably.
Updated Z guides now published.
These are as long as will physically fit for maximum stability.
I've deleted the previous version.
https://www.thingiverse.com/thing:4580455